When the software “hangs up” are you actually getting the “Reference Manager Select Matching Reference” dialog? If so, please see this article:
http://help.thomson.com/default.asp?portalid=TSC&article=84552
If you are not getting the “Reference Manager Select Matching Reference” dialog, there may be an issue with the database. Here is what you can try:
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Open the database.
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Create a new database by clicking the file menu and selecting New Database.
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Pick a name and location and then click New.
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Click the References menu and select Copy Between Databases.
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For the Source, make sure your original database is listed and set this to “All References in List.”
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Make sure the new destination database is listed.
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Click Copy.
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Click Yes to All.
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When that is done copying, click on the File menu and select Close Database.
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Select the original database and click Close Database.
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Click Activate for the current database.
Once this is done, open your document and see if you can use the Update command.